EVR meaning in Community ?

Electronic Video Recording, or EVR, was a film-based video recording format developed by Hungarian-born engineer Peter Carl Goldmark at CBS Laboratories in the 1960s.

CBS announced the development of EVR on August 27, 1967. The 750-foot film was stored on a 7-inch-diameter (180 mm) spool in a plastic cartridge. It used a twin-track 8.75 mm film onto which video signals were transferred by electron beam recording, two monochrome tracks in the same direction of travel.Some EVR films had a separate chroma track in place of the second program monochrome track for color EVR films. The images stored on an EVR film were visible frames much like motion picture film, and were read by a flying-spot scanner inside an EVR player to be converted to a video signal to be sent to a television set.

EVR was also released by CBS as a professional version for television broadcasting, called BEVR (Broadcast EVR). As a professional medium, the format offered extremely high quality. It was, however, quickly superseded by professional and consumer magnetic tape formats.